Change Go module name from `soundbox-go` to `soundbox`

Go modules should be named with a single word if possible (see the
[standard libraray][1] as a reference example). Furthermore the module
name will be present in the code very often and thus length is a
critical point.

The repository and project should still be named `soundbox-go` to
distinguish it from the device repository [soundbox][2] and the
application repository [soundbox-app][3].

[1]: https://pkg.go.dev/std
[2]: https://cgit.xengineering.eu/soundbox
[3]: https://cgit.xengineering.eu/soundbox-app

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